CI: test_get_data is falky

https://gitlab.esrf.fr/workflow/ewoksapps/est/-/jobs/819171

https://gitlab.esrf.fr/workflow/ewoksapps/est/-/jobs/816122

period = 0.01
spectrum_cu_from_larch = <est.core.types.spectrum.Spectrum object at 0x7f97f3c63ee0>
tmpdir = local('/tmp/pytest-of-root/pytest-0/test_get_data_0_01_0')
    @pytest.mark.parametrize("period", [0.01, 0.1, 0.5])
    def test_get_data(period, spectrum_cu_from_larch, tmpdir):
        filename = str(tmpdir / "data.h5")
        scan = "1.1"
        npoints = len(spectrum_cu_from_larch.energy)
        positioners = {"energy": spectrum_cu_from_larch.energy}
        detectors = {"mu": spectrum_cu_from_larch.mu}
        npoints = spectrum_cu_from_larch.energy.size
        blocksize = max(int(npoints / 10), 1)
        est_time = npoints / blocksize * period
        tmax = time.time() + est_time + 5
        print("Estimated scan time", est_time, "s")
    
        urls = [
            f"silx://{filename}::/{scan}/measurement/energy",
            f"silx://{filename}::/{scan}/measurement/mu",
        ]
        with nxwriter_process(filename, scan, positioners, detectors, blocksize, period):
            nprogress = 0
            while nprogress != npoints:
>               data = [get_data(url, retry_timeout=3) for url in urls]
src/est/tests/test_acquisition.py:34: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
src/est/tests/test_acquisition.py:34: in <listcomp>
    data = [get_data(url, retry_timeout=3) for url in urls]
/usr/local/lib/python3.8/site-packages/silx/utils/retry.py:165: in wrapper
    return method(*args, **kw)
src/est/io/utils/read.py:58: in get_data
    dset = h5[data_path]
h5py/_objects.pyx:54: in h5py._objects.with_phil.wrapper
    ???
h5py/_objects.pyx:55: in h5py._objects.with_phil.wrapper
    ???
/usr/local/lib/python3.8/site-packages/h5py/_hl/group.py:357: in __getitem__
    oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
h5py/_objects.pyx:54: in h5py._objects.with_phil.wrapper
    ???
h5py/_objects.pyx:55: in h5py._objects.with_phil.wrapper
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
>   ???
E   KeyError: 'Unable to synchronously open object (addr overflow, addr = 6416, size = 328, eoa = 2048)'
h5py/h5o.pyx:189: KeyError
----------------------------- Captured stdout call -----------------------------